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Upper airway changes following single-step or stepwise advancement using the Functional Mandibular Advancer
Isil Aras1, Aylin Pasaoglu2, Sultan Olmez3
1Department of Orthodontics, Faculty of Dentistry, Ege University, 35080, Bornova, Izmir, Turkey. isilaras@gmail.com.
Summary
The Functional Mandibular Advancer (FMA) treatment method, whether single-step or stepwise, did not significantly alter pharyngeal airway dimensions, soft palate, tongue, or hyoid bone position in Class II subjects.
Area of Science:
- Orthodontics
- Craniofacial Morphology
- Airway Analysis
Background:
- Mandibular advancement is used to treat Class II malocclusion.
- Understanding its effects on the pharyngeal airway is crucial for treatment planning.
Purpose of the Study:
- To compare pharyngeal airway dimensions, soft palate morphology, and tongue/hyoid bone position changes after single-step vs. stepwise mandibular advancement using the Functional Mandibular Advancer (FMA).
Main Methods:
- 51 peak-pubertal Class II subjects were analyzed.
- 34 patients were randomized into single-step (SSG) or stepwise (SWG) FMA groups; 17 served as controls (CG).
- Pre- and post-treatment lateral cephalometric radiographs were used, with data analyzed via t-tests, ANOVA, and Pearson's correlation.
Main Results:
- Both SSG and SWG showed significant oropharyngeal airway enlargement and reduced soft palate angulation compared to CG.
- Tongue height increased significantly only in the SWG.
- Hyoid bone showed more forward movement in SSG and SWG, but vertical changes were not significant.
Conclusions:
- The method of mandibular advancement (single-step vs. stepwise) with FMA did not significantly impact pharyngeal airway, soft palate, tongue, or hyoid bone changes.
- Both advancement methods yielded comparable outcomes regarding the evaluated craniofacial structures.
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